[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

WrightTools/_group.py

@@ -411,7 +411,7 @@ def save(self, filepath=None, overwrite=False, verbose=True):
     def items(self):
         for k in self.keys():
             yield k, self[k]
-    
+
     def values(self):
         for k in self.keys():
             yield self[k]